post_content, $match ) ) { $tags = \implode( ', ', $match[1] ); \wp_add_post_tags( $post->post_parent, $tags ); } return $id; } /** * Filter to replace the #tags in the content with links * * @param string $the_content the post-content * * @return string the filtered post-content */ public static function the_content( $the_content ) { // small protection against execution timeouts: limit to 1 MB if ( mb_strlen( $the_content ) > MB_IN_BYTES ) { return $the_content; } $tag_stack = array(); $protected_tags = array( 'pre', 'code', 'textarea', 'style', 'a', ); $content_with_links = ''; $in_protected_tag = false; foreach ( wp_html_split( $the_content ) as $chunk ) { if ( preg_match( '#^$#i', $chunk, $m ) ) { $content_with_links .= $chunk; continue; } if ( preg_match( '#^<(/)?([a-z-]+)\b[^>]*>$#i', $chunk, $m ) ) { $tag = strtolower( $m[2] ); if ( '/' === $m[1] ) { // Closing tag. $i = array_search( $tag, $tag_stack ); // We can only remove the tag from the stack if it is in the stack. if ( false !== $i ) { $tag_stack = array_slice( $tag_stack, 0, $i ); } } else { // Opening tag, add it to the stack. $tag_stack[] = $tag; } // If we're in a protected tag, the tag_stack contains at least one protected tag string. // The protected tag state can only change when we encounter a start or end tag. $in_protected_tag = array_intersect( $tag_stack, $protected_tags ); // Never inspect tags. $content_with_links .= $chunk; continue; } if ( $in_protected_tag ) { // Don't inspect a chunk inside an inspected tag. $content_with_links .= $chunk; continue; } // Only reachable when there is no protected tag in the stack. $content_with_links .= \preg_replace_callback( '/' . ACTIVITYPUB_HASHTAGS_REGEXP . '/i', array( '\Activitypub\Hashtag', 'replace_with_links' ), $chunk ); } return $content_with_links; } /** * A callback for preg_replace to build the term links * * @param array $result the preg_match results * @return string the final string */ public static function replace_with_links( $result ) { $tag = $result[1]; $tag_object = \get_term_by( 'name', $tag, 'post_tag' ); if ( $tag_object ) { $link = \get_term_link( $tag_object, 'post_tag' ); return \sprintf( '#%s', $link, $tag ); } return '#' . $tag; } }